Table 3. Patient’s preoperative risk factors for venous thromboembolism.

VTE: venous thromboembolism; IUDS: intrauterine device; OSA: obstructive sleep apnea

Variables	Values
Previous VTE, n (%)	7 (0.8%)
Peripheral venous disease, n (%)	138 (15.3%)
Thrombophilia, n (%)	2 (0.2%)
Hormonal therapy, n (%)	285 (39.8% of female patients)
a. Combined oral contraceptive	165 (23%)
b. Combined transdermal patch	2 (0.3%)
c. Combined vaginal ring	14 (2%)
d. Progestogen-only oral contraceptive	26 (3.6%)
e. Progestogen-only implants	17 (2.4%)
f. Hormonal IUDs	56 (7.8%)
g. Copper IUDs	4 (0.6%)
h. Hormonal replacement therapy	1 (0.1%)
Smoking habits, n (%)	260 (28.9%)
a. Current smokers	139 (15.4%)
b. Former smokers	121 (13.4%)
Respiratory disease, n (%)	193 (21.1%)
a. OSA	130 (14.4%)
b. Obesity-hypoventilation syndrome	3 (0.3%)
c. Asthma	56 (6.2%)
d. Chronic obstructive pulmonary disease	4 (0.4%)
Cardiovascular risk factors, n (%)
a. Arterial hypertension	347 (38.5%)
b. Diabetes mellitus	167 (18.5%)
c. Hyperlipidemia	263 (29.2%)
Inflammatory intestinal disease, n (%)	1 (0.1%)